Finding the Fourth Proportional to 2,890.42, 3,987.31 and 1,755.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,890.42 : 3,987.31 = 1,755.79 : x
2. Step 2: Convert to fraction form
   2,890.42/3,987.31 = 1,755.79/x
3. Step 3: Cross multiply
   2,890.42x = 3,987.31 × 1,755.79
4. Step 4: Simplify right side
   2,890.42x = 7,000,885.61
5. Step 5: Solve for x
   x = 7,000,885.61/2,890.42
6. Step 6: Final answer
   x = 2,422.10